AppArmor policy update for os-brick and iSCSI

In iSCSI usecases including cinder-lvm, os-brick requires lock files
such as:
  - /run/lock/nova/os-brick-connect_volume
  - /run/lock/nova/os-brick-connect_to_iscsi_portal-192.168.0.1

and lsscsi requires following access to compose a rescan command such as
"/sys/bus/scsi/drivers/sd/2:0:0:0/rescan":
  - /dev/
  - /sys/bus/scsi/devices/

Closes-Bug: #1979812
Related-Bug: #1939390
Change-Id: Id2db3a70b8d1287bda006f1bbc5442038f7070f1
(cherry picked from commit cf0f464391)

templates/usr.bin.nova-compute

@@ -31,6 +31,7 @@
   deny /* w,
 
   /bin/* rix,
+  /dev/ r,
   /dev/disk/** r,
   /dev/disk/by-id/* r,
   /dev/mapper/control wr,
@@ -72,7 +73,7 @@
   /run/libvirt/libvirt-sock rw,
   /run/lock/iscsi/ rw,
   /run/lock/iscsi/** rwl,
-  /run/lock/nova/nova-iptables wk,
+  /run/lock/nova/* wk,
   /run/lock/qemu-nbd-nbd* w,
   /run/openvswitch/db.sock rw,
   /{usr/,}sbin/blockdev rix,
@@ -90,6 +91,7 @@
   /{usr/,}sbin/e2label rix,
   /{usr/,}sbin/tune2fs rix,
   /sys/block/ r,
+  /sys/bus/scsi/devices/ r,
   /sys/class/fc_host/{,**} r,
   /sys/class/iscsi_host/ r,
   /sys/class/iscsi_session/ r,